Flexible-base jack



c, w. RIPSCH AND 1 c. DAWLEY. FLEXIBLE BASE JACK.

APPLICATION FILED JUNE 9,1919. 1,346,847, Patented July 20, 1920.

IN VEN TORS.

CHARLES W RIPScH.

- z. v a 3 7 UNITED STATES PATIENT or Free.

CHARLES w. RIPS'CHAND JAMES c. DAIWLEY, oF-DAYron, OHI assrenoits o rrinJOYGE-CRIDLAND COMPANY, or DAYTON, 'OI-IIO, 'A CORPORATION oF,o1 -IIo.

I FLEXIBLE-BASE JACK.

Application ma ;Tune 9, 191a Serial No. 302,560.

' To all whom may concern."

Be it known that we, CiiARLEs W. Hagen and JAMES C. DAWLEY, citizens 'ofthe United States, residing at Dayton, in the county of Montgomery andState of Ohio,

have invented certain new and useful Improvements in FleiribleeBaseJacks, of which the following is a specification, reference being hadtherein to the accompanying draw- Thisinvention relates to lifting jacksand with the base. j V I I 'One object of the invention is to providesuch a jack in which the standard will be so the standard for pivotalmovement.

connected with the base as te form a very strong durable construction,which will not be distorted by the severe strains to which it issubjected in service. v

A further object of the invention is to provide-such a jack having animproved latch which can be easily operated to release A. further objectof the invention is to provide in such a jack an operating device forthe lifting element which can be easily manufactured and assembled withthe standard. I s 4 In the accompanying drawings Figure 1 is a frontelevation of. a lifting jack embodying our invention, partly in section;Fig. 2 is a side elevation of such a jack; and

' Fig. 3 is a section taken on the line 3-3 of Fig. 2. I In thesedrawings we have illustrated one embodiment of our invention and have.shown the same as applied to a lifting jack of that type commonly knownas a pole jack, that is, a jack for withdrawing telephone poles and thelike from the ground. It will be understood, however, that thisparticular form of jack has been chosen forthe purposes of illustrationonly and that the invention can be applied'either in part or in ts I I II I easily accessible for machining and very I5;1tirety to jacks ofvarious kinds,'and par- V I I I I materiallv reduces the labor and,conseticulaflyitc what are known as emergency jacks; I j II .As hereshown, the jack comprises a base 1 which is provided with a pair ofupwardly extending lugs rigidly secured thereto and preferably formedintegraltherewlth. These V Specification of Letters raiellt; atent dJfilyzl), 1920,

.lugsare spaced some distance apart and are lower ends bearing lugs orears -5 which exten dbetween the bearing lugs 2 0f'the base and arepivotally connected tothose slugs by meansofpins 6. The pins 6 servemerely to connect the standard with thebase and thev do not, carrytheweight of'the standard and its load. The weight of the load istransmitted directly from the standard to the base and, to this end,the1 upper edges of the bearing lugs 2 of the base are j curved aboutthe axis of the pivot pins 6 n COIIstitute bearing surfaces. Eachsidemember of the standard is provided with an outwardly projecting'fiange,7, the lower surface of which is curved about thejaxis ofthe pins 6 andrests upon the bearing surface of thecorresponding lug 2, fand thesebearing surfaces transmit the thrust directly from the standard to thebearing lugs of the der. the load or after it has received the 7 base,and at the same time'permit the standload. By this arrangement of thebearing lugs of the base, the former are held rigidly againstanytendency to spread, due to the strains to which they are subjected inserv- I lugs of the standard within, the bearing ing lugsof the base areplaced between the side members thereof, there is a tendency to spreadorto be otherwise distorted. Further. this construction is such that thelugs on the base can be made of a very strong rigid construction;andfurther, it results in I the placing of the bearing surfaces on theouter sides of the side members of the standard instead of between"these side members; and thus renders these surfaces very latchiwhich ishere shown as a dog-8 pivQtally mounted on the base and having its.

'constructionalso permits the pitchradius of nose arranged to engage ashoulder 9 on the lower portion of the standard and to hold the standardagainst movement about the axis of the pivot pins 6. This dog hasconnected therewith an operating member or foot piece 10 which is actedupon by a spring ll to hold the dog normally in engagement with the lug9. This foot piece is so arranged as to be easily manipulated by theoperator while both hands are otherwise occupied, and addsvery-materially to the convenience and ease of the operation'of thejack, particularly where the standard is to be swung about its, axiswhen under load. Mounted within the standard 3 1s a liftlng member 12which maybe of any suitable character, but is here shown as providedalong one edge with teeth 13. Cooperating with these teeth is a toothedsegment 14 which is pivotally mounted between bearing lugs 15 on thestandard and is connected with a lever 16, by means of whichit isoperated to impart movement to the toothed lifting member or rack bar.The pinion is so mountedon the standard that upon the downward movementof the lever the toothed segment will engage the teeth of the rack andimpart'upward movement to the v latter. 'Upon the upward or idle strokeof the lever the teeth of the segment will ride over the teeth of therack, forcing the segment bodily away from the rack, thus permitting thesegment to engage otherteeth farther down on the rack. A dog 17 holdsthe lifting member in its elevated position and prevents the rearwardmovement thereof during the idle stroke of the lever. The

segment 14 preferably has its trunnions 18 formed integral therewith,and the bearings for these trunnions are in the form of upwardly andrearwardly inclined slots 19 which are open at their upper ends so thatthe device maybe assembled by merely placing the segment between thebearings lugs 15 and permitting the trunnions to move "downwardly in theopen ended slots. Pins 20 are driven through the upper ends of the slotsto retain the 'trunnions therein. This construction of the segment verygreatlycheapens the production of the, jack, inasmuch as the one piecestructure can be manu factured and assembled with much less labor thancan a two piece construction, in which 7 the two parts, are madeseparately and assembled after the segment has been placed inpositionbetween the bearings lugs. Further, such 'a device has muchgreater strength than has the two piece construction. This the segmentto be madesmaller without weakcning the structure than is practical inother 1. In a lifting jack, a base having a pair.

of short upwardly extending lugs provided with bearing surfaces alongtheir upper edges, a standard comprising side members having'a guidewaybetween them, each of 1 said side members terminating at its lower endin a lug, the lugs of said standard being arranged between the lugs ofsaid base, pivot pins to connect the lugs of said standard to the lugsof said base, each of said side members having on its outer side ashoulder forming a bearing surface to cooperate with the bearing surfaceof the corresponding lug on said base to support the load on saidstandard, said bearing surfaces being curved about the axls of saidplvot mm to permit said standard to have pivotal movement relatively tosaid base, a lifting member mounted in said guideway between saidsldemembers and an operating devlce mounted on said standard to actuate saidlifting memben. I V

2. In a lifting jack, a base having a pair of short upwardly extendinglugsprovided with bearing surfaces along their Inpper' edges, 21standard comprising side members having a guideway. between them,

each ofsaid side members terminating at its lower end 1n a lug, the lugsof'said standard being arranged between the lugs of said base, pivotpins to connect the, lugs of said standard to the lugs of said base,each of said side members having on its outer side a shoulder forming abearing surface to'cooperate with the bearing surface of the correloadon said standard, said bearing surfaces being curved about the axis ofsaid pivot sponding lug on said base to supportthe x member mounted onsaid guideway between said side members, an operating device ,mounted onsaid standard to actuate said liftlng. member, a latch mounted on saidbase to engage a part of said standard toQho'ld the. latter aganistpivotalv movement, and a downwardly movable tripping device for" saidlatch.

3. In a lifting jack, abase having a pair 7 of upwardly extending lugsprovided with bearing surfaces along their upperedges, a standard hav ngbear ng surfaces to cooperate wlth the bearing surfaces of sai dh g tosupport the load on the standa' dind havmg lugs extendlngdownwardlybeside the lugs on said base, pivot pins to attach said manate saidbase, a lifting memberhav-- 7 mg teeth along one edge thereof,atoothed186 segment adapted to mesh with theteeth of ends to receive therespective trunnions of the said lifting member I and having saidsegment. I trunnions formed integral therewith, and a In testimonywhereof, We afiix our signa- 10 lever connected With said segment, saidtures hereto.

5 standard having bearing lugs to receive said segment between them andprovided With CHARLES W. RIPSCH. bearing slots Which are open at theirupper I JAMES C. DAWLEY.

